All merchandise imported into the United States is required to be cleared through U.S. Customs & Border Protection (CBP). Clearance is obtained by filing an “entry” with CBP. In 2021 the United States imported $2.8 trillion dollars’ worth of goods. The bulk of that cargo arrived on vessels, loaded into 32,970,647 ocean shipping containers. So, there is a reasonably good chance that you have clients who have or may have contact with CBP in regard to the importation of merchandise.